Electronic cigarette



FIG. 1 is a front elevational view of an electronic cigarette showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines illustrating portions of the electronic cigarette form no part of the claimed design. 

The ornamental design for an electronic cigarette, as shown and described. 